A gearbox assembly includes a plurality of planet gears and a planet carrier including a plurality of planet gear pockets. Each planet gear is mounted in a respective planet gear pocket about a pin. The planet carrier is characterized by a planet carrier envelope in a range of 2.7 and 4.50. The planet carrier envelope is equal to a product of a planet gear pocket aspect ratio multiplied by a planet carrier radial ratio. The planet gear pocket aspect ratio is D